1) Inspect whether air flow volume can be switched to the 4 levels between 1st and 4th when the fan speed control dial is operated.
1) Measure the resistance between the blower resistor terminals using a DMM.

| Inspection location |
Terminal No. |
Resistance |
| 1st position |
2-3 |
4.54 Ω |
| 2nd position |
3-4 |
2.50 Ω |
| 3rd position |
1-3 |
1.00 Ω |